• Title/Summary/Keyword: 이산화탄소 배출가스

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Optimum Mix of Extrusion panel Using Low Energy Curing Admixture (LA) based on Ground Granulated Blast-Furnace Slag and Ladle Furnace Slag (고로슬래그와 환원슬래그를 기반으로 한 저에너지양생용 결합재를 사용한 압출성형패널의 최적배합)

  • Kim, Ha-Seog;Baek, Dae-Hyun;Lee, Sea-Hyun
    • Resources Recycling
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    • v.24 no.2
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    • pp.13-22
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    • 2015
  • $CO_2$ emitted from building materials and construction materials industry reaches about 67 million tons, which occupy about 30 % of $CO_2$ emitted from the construction field. Controls on the use of consumed fossil fuels and reduction of emission gases are essential for the reduction of $CO_2$ in the construction area as we reduce the second and third curing to emit $CO_2$ in the construction materials industry. Accordingly, this study applied the low energy curing admixture (hereinafter "LA") to the extruded panels to observe the physical properties, depending on the mixing amount of fiber, type of fiber and mixing ratio of fiber. The type of fiber did not appear to be a main factor to affect strength, while the LA mixing ratio and mixing amount of fiber appeared to be major factors to affect strength. Especially, the highest strength was developed when the LA mixing ratio was 40%, whereas the test object with the mixing ratio of 50% resulted in the decrease of strength. In addition, it appeared that the mixing ratio of fiber greatly affected flexural strength and strength increased as the mixing ratio increased.

Flow Characteristics and Wind Loads on the Solar Panel and Floating System of Floating Solar Generato (부유식 태양광 발전기의 패널과 부유체에 작용하는 풍하중과 유동특성)

  • Ryu, Dae-Gyeom;Lee, Kye-Bock
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.10
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    • pp.229-235
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    • 2019
  • A floating photovoltaic generation system is a new concept that combines existing photovoltaic generation technology with floating technology. This is installed in the water not on conventional land and a building. The system is designed as a unit module type that can be connected to other modules according to the power generation capacity, thereby forming a large-scale power generation facility. As a renewable energy source, it is composed of a floating structure, mooring device, photovoltaic power generation facility, and underwater cable. Because this system is installed outdoors, the effect of the wind load on the structure is very large. In this study, the wind loads most affected on the floating photovoltaic generation structure were obtained by computational fluid dynamic analysis. The flow characteristics and wind loads were analyzed for a range of wind orientations and angles of inclination. The analysis showed the position and magnitude of the maximum wind load to the wind direction and the flow characteristics around the solar panel and floating system. The wind load increased with increasing angle of inclination of the panel to the ground.

Combustion Characteristic Study of LNG Flame in an Oxygen Enriched Environment (산소부화 조건에 따른 LNG 연소특성 연구)

  • Kim, Hey-Suk;Shin, Mi-Soo;Jang, Dong-Soon;Lee, Dae-Geun
    • Journal of Korean Society of Environmental Engineers
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    • v.29 no.1
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    • pp.23-30
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    • 2007
  • The ultimate objective of this study is to develop oxygen-enriched combustion techniques applicable to the system of practical industrial boiler. To this end the combustion characteristics of lab-scale LNG combustor were investigated as a first step using the method of numerical simulation by analyzing the flame characteristics and pollutant emission behaviour as a function of oxygen enrichment level. Several useful conclusions could be drawn based on this study. First of all, the increase of oxygen enrichment level instead of air caused long and thin flame called laminar flame feature. This was in good agreement with experimental results appeared in open literature and explained by the effect of the decrease of turbulent mixing due to the decrease of absolute amount of oxidizer flow rate by the absence of the nitrogen species. Further, as expected, oxygen enrichment increased the flame temperatures to a significant level together with concentrations of $CO_2$ and $H_2O$ species because of the elimination of the heat sink and dilution effects by the presence of $N_2$ inert gas. However, the increased flame temperature with $O_2$ enriched air showed the high possibility of the generation of thermal $NO_x$ if nitrogen species were present. In order to remedy the problem caused by the oxygen-enriched combustion, the appropriate amount of recirculation $CO_2$ gas was desirable to enhance the turbulent mixing and thereby flame stability and further optimum determination of operational conditions were necessary. For example, the adjustment of burner with swirl angle of $30\sim45^{\circ}$ increased the combustion efficiency of LNG fuel and simultaneously dropped the $NO_x$ formation.

Effect of Added NH$_3$ to AMP on Absorption Rate for Simultaneous Removal of CO$_2$/NO$_2$ in Composite Absorption Process (복합흡수공정에서 CO$_2$/NO$_2$ 동시제거 시 AMP(2-amino-2-methyl-1-propanol)에 Ammonia 첨가가 흡수속도에 미치는 영향)

  • Seo, Jong-Beom;Choi, Won-Joon;Moon, Seung-Jae;Lee, Gou-Hong;Oh, Kwang-Joong
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.12
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    • pp.1287-1293
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    • 2008
  • In this study, a blend of 2-amino-2-methyl-1-propanol (AMP) and ammonia (NH$_3$) was used to achieve high absorption rates for carbon dioxide (CO$_2$) as suggested at several literatures. The absorption rates of aqueous AMP and blended AMP+NH$_3$ solutions with CO$_2$ and nitrogen dioxide (NO$_2$) were measured using a stirred-cell reactor at 303 K. The effect of the added NH$_3$ to enhance absorption characteristics of AMP was studied. The performances were evaluated under various operating conditions. The absorption rates increased following the increase of the concentration of NH$_3$. The absorption rate of NH$_3$ blended into 30 wt.% AMP solution with NO$_2$ at 303 K was 12.6$\sim$32.6% higher than that of aqueous AMP solution without NH3. Also, the addition of 3 wt.% NH$_3$ to 30 wt.% AMP increased 48.2$\sim$41.6% values for the reactions with CO$_2$ and NO$_2$ at 303 K. Therefore, it clearly shows that the reaction rate of AMP with CO$_2$ and NO$_2$ can be increased by the addition of NH$_3$.